6,407,900
2.5368 already has 5 significant digits.
The first 3 significant digits of a number are the first 3 digits starting from the left ignoring any leading zeros. So 31456 = 31500 (3 significant digits) The 5 in the "56" rounds the 4 up.
There are 5 significant digits in 18.0140.
5 significant digits because the 2 zeros are in between other significant digits.
To round numbers to the correct number of significant figures, start by identifying the last significant figure you want to keep. Then, look at the next digit - if it is 5 or greater, round up; if it is less than 5, round down. Finally, adjust the rest of the digits to the right of the last significant figure to zeros.
To round to 3 significant digits, start counting from the first non-zero digit. If the digit to the right of the third significant digit is 5 or greater, round up. If the digit is less than 5, leave the third significant digit unchanged. Replace all digits to the right of the third significant digit with zeros.
All of the digits are significant digits in this case. A zero between other (non-zero) digits is considered significant.
All the digits are significant, so there are 5 significant digits.
There are 2 significant digits: 5 and 4
281000, or 2.81 x 10^5.
You have to round to two significant digits because 5.5 only has two. So, 5.5 × 2.141 = 12
There are three rules that are used when rounding to a desired number of significant digits (figures): 1. All digits that are not zero, are significant 2. In a number that does not have a decimal point, all zeros between two non-zero digits are significant digits 3. In a number that has a decimal point, all zeros after the leftmost non-zero digit are significant Examples: 12345 rounded to 3 significant digits: 12300, or 1.23 x 104 12.345 rounded to 3 significant digits: 12.3, or 1.23 x 101 0.012345 rounded to 3 significant digits: 0.0123, or 1.23 x 10-2 0.012045 rounded to 3 significant digits: 0.0120, or 1.20 x 10-2 In the last example the zero after 2 is significant. That is the reason for keeping it in the result when rewriting it in powers of 10 notation.